Receiver-circuit control from single jack and plug



y 1930- I H. G. RICHTER 1,769,754

RECEIVER CIRCUIT CONTROL FROM SINGLE JACK AND PLUG Filed Jan. 15, 1926 ,ATTOR Y Patented July 1, 191% UNH "T iaise HENRY Gr. RICHTER, OF ROSELLE PARK, NEW JERSEY RECEIVER-CIRCUIT CONTROL FROM SINGLE JACK AND PLUG Application filed January 13, 1926. Serial No. 81,128.

This invention relates primarily to the modulation of electro-magnetic translating devices including a special form of jack and plug construction. Principally, the invent-ion is applicable to a loud speaker for radio receivin sets and one advantage thereof is to e ect readily the desired modulation of the sounds reproduced by the loud speaker, by recourse to a simple manipulation of a single plug in its jack. To effect this modulation, the invention contemplates a deliberate and selective change in the fundamental connections of the apparatus in which a sound controlled periodic electric variation is functioning, with an instrumentality leading a current responsive to said electric variations to a translating device.

More particularly, it is an object of the invention readily to provide for the connection of a plurality of instrumentalities in which a sound controlled electric variation is functioning to a translating device both in parallel.

The above and further objects of the invention will be pointed out more particularly in the following claims which are directed to the illustrative embodiment of the invention described in the following specification in connection with the accompanying drawings, solely for the purposes of illustration and not limitation.

- In the drawings,

Fig. 1 is a diagrammatical showing of interconnected instrumentalities for practicin my invention;

Fig. 2'is a fractional view corresponding to Fig. 1, but showing a second position for the plug; and

Fig. 3 likewise shows a third position for the plug.

1', 1' and 1" indicate respectively interconnected triods for an amplifying receiving set which are to be understood as provided with the usual sources of current and the usual connections, the particular hookup being immaterial.

2' and 2 indicate transformers for different stages of the apparatus. Although the transformers indicated are of the audio-frequency type, this showing is not intended to be a limitation. The terminals of the primaries and secondaries are respectively connected by P P S and S D indicates a jack associated with a panel board .4 and providing contact elements 5, 6, 7 and 8 for cooperating with a plug 9 of usual construction, adapted as is customary for connection with an electro-magnetic translating device 10 such as a loud speaker through local cord connections 11. It is preferable that the contact 5 be the B battery connection. Thus for the position of the parts shown in Fig. 1, the loud speaker 10 has connected through it the B 'battery connection, and then the circuit extends from the tip 12 by two parallel paths one through the contact 6 and one through the contact 8, the first to the primary winding of transformer 2" and the second to the primary winding of thetransformer 2, that is, two stages of the triod apparatus are connected in parallel through the loud speaker. I do not attempt positively to define the the ory by which-this parallel connection effects a pleasing smoothing out of the tone in a loudspeakery'but it is my surmise that the electric wave composition which must be effected by the parallel connection leading to one of the legs of the loud speaker very likely annuls most of the undesirable electric vibrations and passes the tonic desirable vibrations. Again, there is the possibility that the phase displacement always present between apparatus in separate stages of triad amplifiers may effect upon recompositionthrough the medium of the parallel circuits a smooth electric wave as it is carried by the current to the loud speaker. In any event, I know by practice that a much smoother, clearer, faithful sound reproduction results from this parallelism in connectin the translating device.-

If the plug 9' is tirust in farther, contact 8 changes its connection from the tip 12 to the stem of the plug and tip 12 connects both with contact 6 and with contact 7, connection still being maintained with B battery contact 5 for the stem or shank of the plug. In this position, shown in Fig. 2,

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a more complex arallelism is brought about. For examp e, the plate circuit of triad 3 is connected through the loud speaker in parallel with the plate circuit of triod 1". This set of connections effects a difier'ent. and more powerful tone for the loud S er.

i er the position of the plug and jack shown in Fig. 3, the plate circuit of triod 1" alone is connected to the tip 12, while both B+ battery is connected to'the stem of the plug and also are the primaries of both transformers 2' and 2". This set of connections efiects a still 7 different tonic modulation.

What I claim and desire to secure by United States Letters Patent is:

1. In a vacuum tube apparatus a jack and plug in which the plug may have any of a a number of operative positions; circuit connections whereby one set of stages is connected in parallel relatively to said plug for one position of said plug; additional contact means for completing a second set of a parallel connections for said plug for second position of said plug.

2; In combination with a loud speaker eicctric sound amplifyingapparatus comprising electrically connected triods constituting a various stages; aplug; contacts cooperating with said plug disposed and connected with various stages of said apparatus whereby one position of said plug connects a plurality of arts of said apparatus in parallel and then a 1n series through said loud speaker, and whereby another position of said plug efiects a similar but different parallel series connection.

In witness whereof, I have signed my 0 name to this specification, this 27th day of July, 1925.

HENRY G. RICHTER. 

